A temporary quickfix for basic breqn.sty use with latexml

breqn.sty.ltxml

# -*- CPERL -*-
# /=====================================================================\ #
# |  breqn.sty                                                          | #
# | Simple temporary patch for LaTeXML                                  | #
# |=====================================================================| #

package LaTeXML::Package::Pool;
use strict;
use warnings;
use LaTeXML::Package;

#**********************************************************************
RequirePackage('amsmath');

Let(T_CS('\begin{dmath}'),   '\align');
Let(T_CS('\end{dmath}'),     '\endalign');
Let(T_CS('\begin{dmath*}'),  '\align*');
Let(T_CS('\end{dmath*}'),    '\endalign*');
Let(T_CS('\begin{dgroup}'),  '\align');
Let(T_CS('\end{dgroup}'),    '\endalign');
Let(T_CS('\begin{dgroup*}'), '\align*');
Let(T_CS('\end{dgroup*}'),   '\endalign*');

DefMacro('\condition[]{}', sub {
    my ($gullet, $delim, $content) = @_;
    $delim = defined $delim ? ToString($delim) : ", ";
    return (T_CS('\text'), T_BEGIN, Explode($delim), $content, T_END);
});
#**********************************************************************
1;

simple_breqn.tex

\documentclass{article}
\usepackage{breqn}
\begin{document}

\begin{dmath}
f(x)=\frac{1}{x} \condition{for $x\neq 0$}
\end{dmath}

\begin{dmath*}
f(x)=\frac{1}{x} \condition{for $x\neq 0$}
\end{dmath*}

\begin{dgroup}
f(x)=\frac{1}{x} \condition{for $x\neq 0$}
\end{dgroup}

\begin{dgroup*}
f(x)=\frac{1}{x} \condition{for $x\neq 0$}
\end{dgroup*}

\end{document}